Minerals Filling in Anhydrite Dissolution Pores and Their Origins in the Ordovician Majiagou Formation of the Southeastern Ordos Basin, China

Table 2

Formation water composition of some wells of the Ordovician Majiagou Formation in the southeastern Ordos Basin.

Well	Formation	Section (m)	Ion content (mg/L)						Total salinity (g/L)	Water type
			K^++Na^+	Ca^2+	Mg^2+	Cl^-	HCO3^-	SO4^2-
Yi 5	Ma5^1	2317.0-2326.0	16749	79320	7660	180940	839	9529	295.04	CaCl2
Yi 6	Ma5^1	2295.0-2336.0	13522	66198	11951	167437	874	6556	266.54	CaCl2
Yi 18	Ma5^4	2358.0-2379.0	36382	10060	916	68225	530	10850	126.96	CaCl2
Yi 8	Ma5^1	2247.0-2257.0	17176	20623	3968	59278	204	20494	121.74	CaCl2
Yi 14	Ma5^1	2279.0-2300.0	9975	15090	1831	43619	394	4822	75.73	CaCl2
Yi 12	Ma5^1	1998.0-2034.5	2548	2347	610	8575	170	1607	15.86	CaCl2